Most of the products in daily life need to be coated with a layer of film. The materials of the products are different, the types are different, and the layers to be coated are different. It is necessary to use different coating machines, like the flexible products we come into contact with every day. For example, packaging films, conductive films, touch screens, etc., all use web pvd coating machines. web pvd coating machines are widely used in daily life, and the cost will be much higher than    other coating machines. Taiwan web pvd coating machine, what problems need to be considered?

         First: the problem of increasing the winding speed. The winding speed is the linear speed of the movement of the strip-shaped substrate, which is a main technical indicator of the winding mechanism. The winding speed of the early domestic coating machine is only 10m/min, and now it is only 80m/min ~ 120m/min. In the EW series products of foreign Japan, the winding speed has reached 300m/min, and the German L. The coating machine produced by H company has reached 600m/min. It can be seen that with the development of coating technology, the winding speed needs to be improved.
      Second: the problem of constant line speed of tape substrates. This issue is also important because the uniform thickness of the coating on the substrate can only be achieved if the winding mechanism guarantees a constant line speed of the tape substrate. This is particularly important for the preparation of functional films for tape-shaped substrates, such as capacitor films.
      Third: the problem of deviation and wrinkling of the tape substrate. With the increase of the winding speed, the belt-shaped substrate will be wrinkled and deflected during the winding and coating process, and in severe cases, the substrate will be broken and the production will be interrupted, which not only affects the production efficiency, but also wastes materials. Therefore, this issue should be fully considered in the design of the winding mechanism.
      The vacuum pumping system of the web pvd coating machine is divided into two groups: the upper chamber and the lower chamber. The lower chamber is an evaporation chamber, which requires a high degree of vacuum. The main pump is mostly an oil diffusion pump. The upper chamber is the substrate winding chamber, which requires a low degree of vacuum, and is a Roots pump unit or a diffusion pump-Roots pump-mechanical pump unit. Generally, the vacuum degree to be achieved in the evaporation chamber is 1x10^-3Pa-2x10^-3Pa, and the working pressure is 1x10^-2Pa-2x10^-2Pa, and the vacuum degree of the winding chamber is usually higher than that of the evaporation chamber. room is an order of magnitude lower. Sometimes the web pvd coating machine uses an augmentation pump (a kind of oil diffusion pump) as the main pump. Although its ultimate pressure is not as good as that of the oil diffusion pump, its pumping speed range extends to the high pressure direction by an order of magnitude, which is very suitable for this type of evaporation coating. process.